Both plans seem doable, even though I don't understand it. Its difficult to comment without more information, like when are you planning to go on this trip. What about night stay in Devsai, camping or tent hotel?
You probably didn't get any reply because, like me, may be people don't understand "Why Muzaffarabad? If you are not going to Neelam valley?" In Plan-1, why are you visiting Muzaffarabad twice? Why send bikes by truck? Is it free? You should consider going to Lahore on bikes and taking them with you to either Islamabad or Mansehra on the coach. Just check which services let you take bikes with you, same thing from Mingora. The high-deck coaches can accommodate bikes in the cargo bay. If you opt for Plan-2, then consider visiting Malam Jabba between Kalam and Mingora. Try to save time elsewhere and go through Devsai twice, Skardu road (170 kms) is extremely hot.
Day-4: Include Shangri-la resort.
Day-5: Skardu to Shigar to Khaplu.
Day-6: Khaplu to Manthoka waterfall to Skardu.